Preparation method of graphene low-temperature battery

A low-temperature battery and graphene technology, applied in the direction of secondary batteries, battery electrodes, battery components, etc., can solve the problems of poor electrical conductivity, reduce the weight specific energy of the battery system, etc., and achieve excellent charging performance and high cycle performance Effect
CN105655652AActive Publication Date: 2016-06-08张博
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
张博
Publication Date
2016-06-08

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Abstract

The invention discloses a preparation method of a graphene low-temperature battery. The preparation method is applied to batteries of lithium titanate negative pole systems. An existing rechargeable battery only can be charged to 50-70% the total battery capacity in a low-temperature environment. The preparation method includes the steps that slurry needed for coating a battery positive pole plate is prepared from a lithium manganate positive electrode, a binding agent and a conductive agent; homogenate of slurry needed for coating a battery negative pole plate is prepared from a conductive agent containing conductive graphene slurry; coating of the battery positive pole and the battery negative pole is carried out, and blank foil is reserved on the upper and lower sides of the positive pole and the negative pole; rolling and cutting of the battery positive pole plate and the battery negative pole plate are carried out; battery assembling is carried out; battery formation and aftertreatment are carried out. The preparation method has the advantages that the battery can be charged to 90% the total battery capacity within 6 min in an environment where the temperature is -40 DEG C, and meanwhile the battery has super-high cycle performance and low internal resistance.
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Description

Technical field:

[0001] The invention relates to a preparation method of a lithium ion battery, in particular to a preparation method of a graphene low-temperature battery. Background technique:

[0002] Due to the advantages of innate materials, lithium titanate batteries have good cycle performance and excellent charging performance. However, according to the characteristics of the lithium titanate battery negative electrode, its poor conductivity (especially at low temperature) is a problem we must face, and the current solution is to achieve it by increasing the content of the conductive agent. It is feasible, but it will invisibly reduce the weight specific energy of the battery system. Due to its good electrical conductivity, excellent hardness and toughness, its combination with lithium titanate can effectively increase the active material ratio of battery materials, and more importantly, it can improve its low temperature and cycle performance while improving the ra...

Claims

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